Two fishermen have been nabbed by Fisheries officers, allegedly leaving Harvey Dam in possession of more than 70 out-of-season marron.
Nearly 60 of the crustaceans were under the legal size limit. Marron fishing season only begins in January.
The two men could face significant charges and fines if convicted.
And it wasn't the only bust of the evening.
A part of the ongoing Operation Kerinci into illegal marron fishing, a further six fishers were also caught in possession of marron and illegal gear throughout the evening.
The crackdown on illegal marron fishing has seen a number of fishers caught out in recent months, including a group of around 30 to 40 people who were planning on fishing in the Wellington Dam in early November.
Public reports said the social group was planning to catch significant amounts of marron as a part of an "annual get-together".
When officers arrived they inspected four vehicles and apprehended a man, along with 22 marron traps in what they called a "significant marron poaching operation."
Another two South West men also copped hefty fines after Fisheries officers caught them with more than 13 times the daily limit of marron back in July.